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  • 1 Chinese Academy of Sciences Key Laboratory of High Power Laser Materials, Shanghai Institute of Optics and Fine Mechanics No. 390, Qinghe Road, Jiading District Shanghai 201800 People’s Republic of China
  • 2 Ministry of Education Key Lab of Functional Inorganic Material Chemistry (Heilongjiang University) Haerbin 150080 People’s Republic of China
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Four novel metal(II) complexes, Ni(L)2, Co(L)2, Cu(L)2, and Zn(L)2 (L = 5-(2-(1,5-dimethyl-3-oxo-2-phenyl-2,3-dihydro-1H-pyrazol-4-yl)hydrazono)-1,3-diethyl-2-thioxo-dihydropyrimidine-4,6(1H,5H)-dione), were synthesized using the procedure of diazotization, coupling and metallization. Their structures were identified by elemental analyses, 1H NMR, ESI-MS and FT-IR spectra. The effect of different central metal(II) ions on absorption bands of the metal(II) complexes was researched. The thermal properties of the metal(II) complexes were investigated by thermogravimetry (TG) and differential scanning calorimetry (DSC). Furthermore, the thermodynamic parameters, such as activation energy (E*), enthalpy (∆H*), entropy (∆S*) and free energy of the decomposition (∆G*) are calculated from the TG curves applying Coats–Redfern method. The results show that the metal(II) complexes have suitable electronic absorption spectra with blue-violet light absorption at about 350–450 nm, high thermal stability with sharp thermal decomposition thresholds.

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